340 stroker 422

Heads are from 67 to 67.5cc.
They are bolted on, did some work today. Tomorrow will cut pushrods, put carb on it and wait till there is time to start this thing.
I have ngk bcp7es plugs, should I give them a shot or go to 8 from the start?

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What head gasket thickness?
Did you say the pistons were .010” down?